Product Introduction
The vacuum disc dryer is an efficient conductive continuous drying equipment. Its unique structure and working principle determine its characteristics such as high thermal efficiency, low energy consumption, small footprint, simple configuration, convenient operation and control, and good operating environment. It is widely used in drying operations in industries such as chemical, pharmaceutical, pesticide, food, feed, and agricultural product processing. It has been well-received in practical applications across various industries. Currently, we manufacture three types: atmospheric, sealed, and vacuum, in four specifications: 1200, 1500, 2200, and 3000, with three material options: A (carbon steel), B (stainless steel for parts in contact with materials), and C (based on B, with additional stainless steel for steam pipelines, main shaft, and support, and stainless steel lining for the cylinder and top cover). The drying area ranges from 4 to 180 m², with hundreds of series models available, along with supporting auxiliary equipment to meet user needs for drying various materials.
Working Principle
Wet materials are continuously added from the feeder to the first drying disc at the top of the dryer. The rake arm with rake blades performs a rotary motion, causing the rake blades to continuously turn over the materials. The materials flow across the surface of the drying disc along an exponential spiral path. Materials on the small drying disc are moved to the outer edge and fall onto the outer edge of the large drying disc below. On the large drying disc, materials move inward and fall from the central discharge port to the next small drying disc below. The small and large drying discs are arranged alternately up and down, allowing materials to continuously flow through the entire dryer. Heating media, such as saturated steam, hot water, or thermal oil, are introduced into the hollow drying discs from one end and discharged from the other end. Dried materials fall from the last drying disc to the bottom layer of the shell and are finally moved by the rake blades to the discharge port for output. Moisture escapes from the materials and is discharged through the moisture exhaust port on the top cover. For vacuum disc dryers, moisture is discharged through the vacuum pump port on the top cover. Dry materials discharged from the bottom can be directly packaged. By adding auxiliary equipment such as fin heaters, solvent recovery condensers, bag filters, dry material back-mixing mechanisms, and induced draft fans, the drying capacity can be enhanced, paste-like and heat-sensitive materials can be dried, solvents can be conveniently recovered, and pyrolysis and reaction operations can be performed.
Performance Characteristics
(1) Easy to control and strong applicability
◎By adjusting the thickness of the material layer, spindle speed, number of rakes, and the type and size of rake blades, the drying process can be optimized.
◎Each drying tray can be individually heated or cooled by introducing hot or cold media, allowing accurate and easy control of material temperature.
◎The residence time of the material can be precisely adjusted.
◎The material flow is unidirectional with no back-mixing, resulting in uniform drying, stable quality, and no need for re-mixing.
(2) Simple and easy operation
◎ The start-up and shutdown operations of the dryer are very simple.
◎ After stopping the feed, the rake blades for conveying materials can quickly empty the materials inside the dryer.
◎ Through the sight glass of the special large inspection door, the inside of the equipment can be carefully cleaned and observed.
(3) Low energy consumption
◎The material layer is very thin, the spindle speed is low, the power required by the material conveying system is small, and the power consumption is low.
◎Drying is carried out by conduction heat, with high thermal efficiency and low energy consumption.
(IV) Good operating environment, solvent can be recovered, and dust emissions meet requirements.
◎Atmospheric type: Due to the low airflow velocity inside the equipment and the humidity distribution being high at the top and low at the bottom, it is difficult for dust to float to the top of the equipment, so the exhaust gas discharged from the top moisture outlet contains almost no dust.
◎Sealed type: Equipped with a solvent recovery device, organic solvents in the moisture-carrying gas can be conveniently recovered. The solvent recovery device is simple with high recovery efficiency. For flammable, explosive, toxic, and easily oxidized materials, nitrogen can be used as the moisture-carrying gas for closed-loop circulation to ensure safe operation. It is especially suitable for drying flammable, explosive, and toxic materials.
◎ Vacuum type: Disc dryer operated under vacuum conditions, especially suitable for drying heat-sensitive materials.
(5) Easy installation, small footprint
◎ The dryer is shipped as a whole unit, transported as a whole, requiring only hoisting into place, making installation and positioning very easy.
◎ Due to the layered arrangement of drying discs and vertical installation, even with a large drying area, the footprint is very small.

Technical characteristics
(1) Drying disc
◎ Design pressure: generally 0.4MPa, maximum up to 1.6MPa.
◎ Maximum operating pressure: generally ≤0.4MPa, maximum up to 1.6MPa.
◎ Heating medium: steam, hot water, thermal oil. Use hot water for heating when drying disc temperature is 100°C; use ≤0.4MPa saturated steam or superheated steam for heating at 100°C to 150°C; use thermal oil for heating at 150°C to 320°C; for temperatures >320°C, methods such as electricity, thermal oil, or molten salt can be used.
(2) Material conveying system
◎Spindle speed: 1～10 rpm, electromagnetic or variable frequency stepless speed regulation.
◎Rake arms: 2～8 rake arms fixed on the spindle on each layer of drying tray.
◎Rake blades: Hinged on the rake arms, able to float up and down with the tray surface to maintain contact, available in multiple forms.
◎Rolling rollers: For materials prone to caking or requiring crushing, rolling rollers are added at appropriate positions to enhance heat transfer and drying process.
(3) The shell is available in three types: atmospheric, sealed, and vacuum.
◎Atmospheric type: cylindrical or octagonal prism shape, available in integral and split structures. The main inlet and outlet pipes for the heating medium can be inside or outside the shell.
◎Sealed type: cylindrical shell, capable of withstanding 5Kpa internal pressure. The main inlet and outlet pipes for the heating medium can be inside or outside the shell.
◎Vacuum type: cylindrical shell, designed pressure of 0.1Mpa. The main inlet and outlet pipes for the heating medium are inside the shell.
(4) Air heater
Generally used in cases with large evaporation capacity to enhance drying efficiency.
Applicable Materials
Drying, Pyrolysis, Combustion, Cooling, Reaction, Sublimation
Organic chemical products, inorganic chemical products, pharmaceuticals, food, feed, fertilizers